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Thermometer

Theme B - The Particulate Nature Of Matter

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Rocket

Theme A - Space, Time & Motion

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Water Wave

Theme C - Wave Behaviour 

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Magnifying Glass Tilted Right

Theme D - Fields

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Microscope

Theme E - Nuclear & Quantum Physics

<ul>
	<li>V-I Graph: A graph showing the relationship between potential difference (Voltage, V) and current (I).</li>
	<li>Ohm&#39;s Law: Founded by Georg Simon Ohm in 1826.</li>
	<li>Ohmic Conductors: Have a constant resistance, and their V-I graphs are straight lines passing through the origin.</li>
</ul>

<ul>
	<li>If V and I are directly proportional, and the line is straight and passes through the origin, the conductor is ohmic.</li>
	<li>If the graph is not a straight line, it represents a non-ohmic conductor.</li>
</ul>

<ul>
	<li>Statement: The potential difference (V) across a metallic conductor is directly proportional to the current (I) flowing through it, as long as the physical conditions remain unchanged.</li>
	<li>Physical conditions: Mainly temperature. So, sometimes, this law emphasizes that temperature shouldn&#39;t change.</li>
</ul>

🌍 Real-world Example: Think of water flowing through a pipe. If you increase the pressure (potential difference), the flow rate (current) will increase too, as long as the pipe (conductor) remains the same size and temperature.

<ul>
	<li>Limitation: Ohm&#39;s law is specific to scenarios where physical conditions don&#39;t change.</li>
	<li>Historical Controversy: English scientist Barlow proposed an alternative theory to Ohm&#39;s. Due to Barlow&#39;s reputation, many initially favored his theory over Ohm&#39;s.</li>
	<li>Science Evolution: Today, the scientific community relies on peer review. Other scientists must replicate and validate original findings before they are accepted as facts.</li>
</ul>

<ul>
	<li>Ohmic Conductor R vs. Non-Ohmic Component S: a. Resistance of R: R = V/I = 6.0V/0.6A = 10&Omega;. (Reminder -&nbsp;Resistance = Potential Difference/Current) b. Resistance of S: As V increases, V/I ratio increases. Thus, resistance of S increases with potential difference. c. Resistance at 6.0V -&nbsp;R = 6.0V/0.3A = 20&Omega;. d. Power Dissipation in S: To get a power of 3.6W, V = 9.0V and I = 0.40A.</li>
</ul>

🌍 Real-world Example: Imagine a water slide. R is like a straight slide where speed (current) remains constant as water volume (voltage) increases. S is like a slide that gets steeper, making the speed change unpredictably as water volume increases.

<ul>
	<li>Setup: Similar to the metal wire circuit, but replace the wire with a filament lamp.</li>
	<li>Procedure:</li>
	<li>Conduct the experiment twice.</li>
	<li>In the second round, reverse the current direction through the lamp. This can be done in two ways - a. Reverse the connections to the power supply. b. Reverse the lamp and record readings as negative (easier).</li>
</ul>

<ol>
	<li>Outcome: Plot V on the y-axis against I on the x-axis, with the origin in the center. This will give a V-I graph for the lamp.</li>
</ol>

🌍 Real-world Example: Think of the filament lamp as a tap. The more you open the tap, the brighter the lamp shines (more current). The V-I graph shows how the brightness (voltage) changes with tap position (current).

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Happy Studying! 🌟 Remember, always stay curious, and the universe of physics will unfold its mysteries.

Theme B - The Particulate Nature Of Matter

Understanding Ohm’s Law: From History To Practical Applications

Table of content

Introduction 🚀

What does the graph tell us? 🤔

Ohm's law in depth 🔍

Unlock the Full Content!

Theme B - The Particulate Nature Of Matter

Understanding Ohm’s Law: From History To Practical Applications

Table of content

Introduction 🚀

What does the graph tell us? 🤔

Ohm's law in depth 🔍

Unlock the Full Content!